nsolid-manager/nsolid/console/bin/simulate.js

A manager that sets up and runs N|Solid for you

/**
 * Spawn a number of processes for simulation during development & testing.
 *
 * Use special @n suffix to spawn n processes
 *
 * Example: Run two instances of the noop scenario
 *
 * ```
 * > NSOLID_APPNAME=monkey node bin/simulate.js test/simulator/scenarios/noop.js@2
 * ```
 *
 */

'use strict'

require('./polyfill')

var path = require('path')
var spawn = require('child_process').spawn
var yargs = require('yargs')
var utils = require('./utils')

process.env.NSOLID_SOCKET = process.env.NSOLID_SOCKET || ':0'
process.env.NSOLID_HUB = process.env.NSOLID_HUB || '127.0.0.1:4001'
process.env.NSOLID_APPNAME = process.env.NSOLID_APPNAME || 'default-nsolid-scenario'

var argv = yargs
.usage(`Spawn a number of processes for simulation during development & testing.
Use special @n suffix after filename to spawn n processes.

Usage: node bin/simulate.js <file.js>[@n]
`.trim())
.demand(1)
.help('h')
.alias('h', 'help')
.argv

argv._.forEach(function (arg) {
  var parts = arg.split('@')
  var script = path.resolve(process.cwd(), parts[0])
  var count = parseInt(parts[1], 10)

  for (var i = 0; i < count; i++) {
    console.error('spawning %s (%s/%s)', path.basename(script), i, count - 1)
    const proc = spawn('nsolid', [script, '-i', i, '-c', count], {
      env: process.env,
      stdio: 'inherit'
    })

    utils.killOnExit(proc, {killAll: false})

    proc.once('error', err => {
      throw err
    })
  }
})